Andorra Liechtenstein Luxembourg Malta Monaco San Marino Vatican City Are a few of the 17 listed on this site: http://geography.about.com/cs/countries/a/smallcountries.htm

Smallest US state would be Rhode Island....All I can think of is Monaco and Holy See (vatican) both which I've been to.

1) The smallest US state is Rhode Island with 3,144 km². Source: http://en.wikipedia.org/wiki/List_of_U.S._states_by_area 2) In this "List of countries and outlying territories by total area", numbers 174 to 232 have less than 3,144 km². Source: http://en.wikipedia.org/wiki/List_of_countries_and_outlying_territories_by_total_area Not all of them are sovereign states. 3) "A microstate (or ministate) is a sovereign state having a very small population or very little land area – usually both. Perhaps the most well-known examples of microstates include Andorra, Liechtenstein, Malta, Monaco, San Marino, Nauru, Palau, Tuvalu, Saint Kitts and Nevis, Singapore and Vatican City. Microstates have a relatively strong influence in the United Nations General Assembly due to the one state, one vote power structure. The smallest fully sovereign microstate is Vatican City, with 911 citizens as of July 2003 and an area of only 0.44 km². The Sovereign Military Order of Malta (SMOM) is an effectively non-territorial sovereign entity that might also be considered to be a microstate; its sovereignty is recognized by dozens of states, but unlike the Vatican City state it has no substantive territorial base (the SMOM's only property, its headquarters buildings, hold "extraterritorial status," similar to an embassy building). Neither the Vatican nor SMOM are members of the United Nations, although both have permanent observer status at the UN, Vatican City as "non-member state", SMOM as "other entity". Microstates should not be confused with micronations, which are not recognized as sovereign states. Special territories like the Channel Islands without full sovereignty are also not considered as microstates." "List of sovereign states with an area less than 1000 km²" "Rank Country / Territory Area (km²) Location 1 Vatican City 0.44 Southern Europe 2 Monaco 1.95 Southern Europe 3 Nauru 21 Oceania - Micronesia 4 Tuvalu 26 Oceania - Polyesia 5 San Marino 61 Southern Europe 6 Liechtenstein 160 Central Europe 7 Marshall Islands 181 Oceania - Micronesia 8 Saint Kitts and Nevis 261 Caribbean 9 Maldives 298 Indian Ocean/Asia 10 Malta 316 Europe - Mediterranean Sea 11 Grenada 344 Caribbean 12 Saint Vincent and the Grenadines 388 Caribbean 13 Barbados 430 Caribbean 14 Antigua and Barbuda 442 Caribbean 15 Seychelles 455 Indian Ocean/Africa 16 Palau 459 Oceania - Micronesia 17 Andorra 468 Southern Europe 18 Saint Lucia 539 Caribbean 19 Singapore 683 Southeast Asia 20 Bahrain 694 Asia - Persian Gulf 21 Federated States of Micronesia 702 Oceania - Micronesia 22 Kiribati 726 Oceania - Micronesia 23 Tonga 747 Oceania - Polynesia 24 Dominica 751 Caribbean 25 São Tomé and Príncipe 964 Central Africa" Source and further information: http://en.wikipedia.org/wiki/Small_Countries To get the list up to 3,144 km², one should add some of the countries of the other list: Samoa, Luxemburg, Comoros, Mauritius.